Start with the exact problem
Write down the app name, device operating system and error message. A problem signing in to the website is different from a subscription that will not activate inside the app. Choose the matching guide before changing account or installation settings.
You cannot sign in
Open the official account page from our login guide. Check the purchase email address and the sign-in method you normally use. Request password recovery from the official flow if needed. Keep recovery messages and verification codes private; this website cannot reset your account.
Your paid product still looks free
Compare the installed product with your receipt. Premium Security, Avast One and other Avast apps are not interchangeable. Check the account email, then use the activation method for that exact app. Do not buy another subscription until you have checked the original purchase.
The installer will not finish
Save the error message and check current system requirements on Avast Support. Restart if the installer requests it, then follow the instructions for that error. Do not download replacement installers from file-sharing sites or disable security settings based on an unsolicited message.
Prepare a useful support request
Provide official Avast Support with the product name, operating system, error text and steps already attempted. Remove private information from screenshots. Payment, account recovery and licence decisions must be handled by Avast or the store that processed your purchase.